Variable condenser



1 sept. 6, 1927.

J. M. ENDERS VARIABLE coNDENsER Filed Sept. 22. 1923 Inventor: Jacob M.Enefa by w; faQ-@ H i S Attorney.

Patented Sept. 6, 1927.

UNITED sra-Tasl PAIENrol-Fxca JACQB M. ENDERS, OF SCHENECTADY, NEW YORK,ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION 0I' NEW YORK.

My invention relates to the construction of electrostatic devices suchas variable c ondenserscomprising two sets of plates in which the platesof'one set are interleaved with those of the other set and are mountedto be moved relatively thereto. The object of my invention is to providean improved construction of the condenser plates whereby accuratespacing of the plates of each set is assured without the use of separatespacing members.

The invention will be better understood by reference to the accompanyingspecification and dra-wing and its scope will be pointed out in theappended claims'. In the drawing, Figure 1 1s a View partly in sectionof a condenser involving my invention; Fig. 2 is a horizontal sectionalview taken on line 2-2 of Fig. 1; and Fig. 3 is a Adetail drawn to alarger scale.

The condenser comprising my invention lis built up of two sets ofsubstantially semicircular plates, a stationar set l and a movable set2, the plates of tile two sets being interleaved and relatively movableWithout contact. The lates comprising each set are identical. achstationary plate has three openings '3 of a size to receive the securingmeans. to be described later.v As shown more clearly in Fig. 3, theplate is rovided at eachopening with two pairsof lntegral ears or bosselements. Ears 4 and 5 of one pair are arranged diametrically oppositeeach other and roject upwardly on the same side of the p ate. Ears 6 and7 of the other pair are also arranged diametrically opposite each otherbut project downwardly on the opposite side of vthe pllate and aredisplaced 90 degrees from theA rst mentioned pair. This ear formationmay be conveniently made by punching an aperture in the plate, from thisaperture lancing the plate in four directions and drawing alternately upand down the adjacent ears thus formed. If greater accuracy is desiredin the spacing of the plates, the plates may then be finished to give adefinite and predetermined height to the ears, the height of the earsbeing one half the space between plates. A series of plates thus formedma be stacked to form a unit by inverting eac lalternate plate so thatthe boss elements of one plate engage the boss elements of the adjacentplate and thus space the plates.

VARIABLE CONDENSER.

Application led September 22, 1923. I Serial No. 664,880.

` For convenience inhandling a set of sta' tionary plates a sleeve l8may be passed through the opening 3, and the unit thus formed firmlysecured to a pair of insulation plates 9 and 10 by bolts 11 and nuts.l12, a suitable spacing washer 13 being shown between the upperinsulation vpla-te 9 and the head of the sleeve 8. f

The plates comprising theV movable set ale each provided with a singleopenin 14 and with integral spacing ears like t ose of the stationaryplates just described.v

They are stacked up in the same manner, each alternate plate beinginverted, and the unit firmly clamped on aspindle 15 between a sleeve 16and a nut 17. The spindle is shown having the usual knob 18 and dial 19.

While I have described only one embodiment of my invention, I do notwish to be limited to the particular form shown and described as it willbe apparent that many modificationstherein may be made without departingfrom the sco e of'my invent-ion as set forth in the appen ed claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,-

1. In -an electric condenser Va plurality of metal plates veach formed.with a portion of the late fo ded to form a boss on one side of t eplate, and with'a dilerent portion of the plate folded to form a boss onVthe opposite side of the late, said plates being assembled in parallelrelation so that therboss' of one plate falls in juxtaposition withrespect to the boss on the adlacent side of the next plate, whereby aspacing is insured be- 'tween the plates greater than the height of4either adjacent boss between any of the plates.

2. In an electric condenser a plurality of metal plates, each having aboss upon each side thereof, said bosses on each plate being formed bythe sections of the plate between 'two incisions in the plate whichcross each other, being folded, one with both its faces projectin to oneside of the plate and the other Ywit both its faces projecting to oneside, to wit, the opposite side of the plate,

and an openin formed in each late between the fold sections of each pate, said plates being arranged in pai-alle relation with respect toeach other and with the bosses in juxtaposition and in ali ent.

3. In an electric-condenser a p urality of nov ' plates. bengarranged inparalle relation with respect to each other and with the bosses injuxtaposition, and in alignment, and means extending through said oenings for binding the plates together in t e relation indicated.

" being" the *original* faces of the-folded serz 4. In an electriccondenser, a plurality of metal plates, each (plate havin an opening anda boss forme about sai" opening in sections,vone section extendingtransverse the 20 plate'on one side' and the other section extendinltransverse the plate on the opposite s ide, t einnerand outer faces ofeach bossg tions2 said plates being assembled in parall relation withthe bosses in juxtaposition, an s means extendinv through said openingfor clamping said pilates together. 'n Y In witness whereof, I havehereunto set my hand this 21st day of September, 1923.

JACOB M. ENDERS

